例1：
#!/usr/bin/perl -w
my $fred ="yabba dabba doo";
my $where1 = rindex($fred,"abba");
print $where1;
my $where2 = rindex($fred,"abba",$where1 - 1);
print $where2;
例2：
#!/usr/bin/perl -w
my $long = "some very long string";
my $right = substr($long,index($long,"l"));
print $right;
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